Profile for Chappo

Name	Chappo
Email Address	peter@mindmechanics.com.au
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Posts	53

2012-05-24 23:23:08

Re: Minor Beta update 23 May

Board » Technical Support

Aaron
There seems to be no limit to the clever, convenient enhancements you keep adding. Your Optimum Angles tool saves me a lot of computing time, many thanks (and my wife says thanks too!)
2011-12-12 03:18:44

Re: SOL World Race: Leg 2 Analysis

Board » Flag Officers » Races

I have been tweeting Askel Magdahl, the navigator on Sanya who pulled off that clever passing move to win the Rio leg of the last Volvo race on Eriksen 3. He said he uses Expedition and Deckman plus some of his own routing software. I wonder what course he is working on for this Dhabi leg??
2011-11-21 02:22:01

Re: General System Spec - to aid SOL development

Board » Technical Discussion

3 year old desktop, 19 inch screen accessing via Firefox

Microsoft Windows XP Professional
Intel Core2 6400 2.13GHz @ 2128 MHz
Graphics Card: 256MB ATI Radeon X1300PRO

2046 MB System RAM (Score: 104)
- RAM Speed: 3191 MB/s

CPU Tests (Score: 210)
- Floating Point Operations/Second: 50669288
- Integer Operations/Second: 123177326
- MD5 Hashes Generated/Second: 710277

Graphics Tests (Score: 33)
- 3D Frames Per Second: 112

Hardware Tests (Score: 10)
- Primary Partition Capacity: 298 GB
- Drive Write Speed: 11 MB/s

Nova Bench score 354

Internet download rate 1.78 Mbps

Screen resolution 1280 by 1024
2011-06-02 11:00:39

Re: Gain or loss by using TWA

Board » Technical Support

How do you find time for work Aaron, you have been very busy creating tools, updating your blog, being very competitive in SOL and now working on SOL development! That sounds like a very flash tool you are working on so I will keep an eye on your blog. Thanks for your great work.
2011-06-02 04:25:14

Re: Gain or loss by using TWA

Board » Technical Support

*8MR, I am not an IT guru but wouldn't these choices be made by the SOL server when you are looking at the forum and perhaps it is configures any large attachments that cannot physically be displayed in the message as attachments only.
2011-06-02 02:58:29

Re: Gain or loss by using TWA

Board » Technical Support

8MR, I see the diagram embedded in the post and as an attachment too?
2011-06-02 02:54:50

Re: Gain or loss by using TWA

Board » Technical Support

Excellent summary 76. I presume it is not to scale but broadly highlights the distance differences. It certainly makes a good case for twa but as Aaron notes, just because the fast yachts have curved tracks, often actually reflects continuously adjusting VMC sailing rather than TWA sailing.
2011-06-02 01:46:19

Re: Gain or loss by using TWA

Board » Technical Support

Good points Aaron, it is easy to work with confidence when plotting within 6 hour weather cycles, much more challenging after 6 hours so CC is a safe option. We have all seen some big shift between weather updates. I note you mentioned you have written a small tool that calculates both max VMG (for upwind & downwind) for a given TWS – , and also maximum VMC given input of TWS, TWD and a CC to the waypoint. Does it link to an uploaded polar or does it just require manual input based on different angles and BS from the polar at the time you choose to do a calc. Is that tool available for download somewhere? I use my simple worksheet attached for my max VMC calcs. I find it pretty good downwind, can be misleading upwind.
2011-05-30 23:14:02

Re: Can't get rankings and race leaderboards

Board » Technical Support

Thanks Jack. Yep I am on the work computer where I am getting the Leaderboard and Rankings. I will check my home PC.
2011-05-30 02:50:42

Re: Gain or loss by using TWA

Board » Technical Support

I have taken advantage of the speed difference of CC or TWA in different races and yachts. I am not an expert but I think the differences come from various factors such as the shape and position you are sailing on the polar, whether you are sailing into a heading or lifting wind change and whether you are going upwind or downwind. So even though the CC is a shorter course, that advantage can often be offset by the fact that the last part of the CC course is so much slower than the TWA course (when sailing upwind into a header, or at the start of a CC course into a freeing wind change, the CC course is much slower than the TWA course.

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